From July 27th to August 5th, 2022, we conducted irradiation test for the electronic circuits to be used at the ATLAS experiment. Gamma ray was irradiated at the Cobalt 60 irradiation facility at Nagoya University.

In the ATLAS experiment, from 2026 to 2028, we will upgrade the trigger and readout system, and plan to acquire ~20 times the current amount of data in 10 years aftrer that. Nagoya University, together with other research institutes of the ATLAS Japan group, is in charge of improving the electronic circuitry of the muon detector named TGC. Since this electronic circuit is placed in a radiation environment, appropriate radiation resistance is required. This time, we irradiated gamma ray to the SFP+ optical transceiver, which is one of the main components of electronic circuits, and evaluated its tolerance against ionizing dose.

We found that the SFP+ optical transceiver satisfies our requirements. Details of the method and results will be reported at the 2022 Fall Meeting of the Physical Society of Japan in September.

Graduate students doing the radiation resistance test